Plate holder



C. BORNMANN PLATE HOLDER April 30, 1929.

Original Filed May 13 1926 INVENTOR CM!- BQQNHA A RNEY Patented Apr. 30,1929.

UNITED STATES PATENT OFFICE.

CARL BORNEIA'NN, OF BINGHAlvITGN, NEW YORK, ASSIGIRTOB, BY MESNE ASSIGN-lYEENTS, TO AGFA ANSCG CORPORATION, OF BINGHAMTON, NEW YORK, A CORPORATION Q1 NEW' YORK.

PLATE HOLDER Application filed May 13,

5 stood however, that such reference is llltO'iiQled to include filmholders as well.

As is well known, the usual plate holder is provided at one end with ahinged flap or member which serves the combined purposes of permittingaccess to the frame, whereby the plates may be placed therein, and alsothat of so closing the lower end of the frame after the sensitized platehas been placed therein, that actinic light is effectively locked out ofsaid frame. To this end, the hinged flap is orcinarily formed to overlapthe lower ends of the side pieces of the holder frame, and is alsoprovided with a groove for receiving the lower end of the darl; slide,when the flap is in closed position, wherehy the same may be so held.

The difficulty of such construction, however, lies in the fact that atthe points of overlapping between the hinged flap and the frame members,there are necessarily cracks and crevices which, unless very tightlyclosed, are apt to admit light through. the frame to the plate in theholder. This is particularly true in the case of holders provided withsprings for normally forcing the plate outwardly into the proper focal.plane. The constant outward pressure of the SPlIiiE? and plate have atendency to open the lillfi'tillflli'i) so that up n the withdrawal ofthe dark ide,

or if the 1 ap happens to be a. loosely litti one, the flap may l forcedopen HllQ' W d's nce, tiius permitting; light to enter around ieoverlapping;- edges and expo-4e the plate or film. is the purpose andprincipal olijcct of my invention to provide a. securing the fiapin itsclosed po means which siinultaneo r L, points of overlapping l frame,therehy pi'evei light leaking; therethroi i.

better insurance agar t light, first hy positively preven ng of the flapby the pressure of the spring or plate within the holder, and secondly,by oinpletely covering all of the joints, cracks, crevices andoverlapping points between the flap and the frame, which constitute theweak points of the holder of today.

An understanding of the manner in which 1926, Serial No. 108,872.Renewed March 8, 1929.

I accomplish these results, may be had by reference to the accompanyingdrawing wherein like reference numerals indicate like parts.

In the drawing:

Figure 1 is a perspective view of my improved plate holder showing thehinged flap in its open position, and illustrating clearly the securing;means therefor.

Fip'ure 2 is front plan vi w of the holder with the flap closed, and thesecuring devices or catches ready to be closed.

Figure 3 Ira is a detail of one corner of t e inc showing the flapclosed and the catch in securing; position.

Figure 42 illustrates av modified form of the catch, and is a detailfigure similar to Figure l have illustrated my invention in connc-ctionwith the usual type or form of plate holders, which comprises the frameincluding side pieces 1 and 2, end pieces 3, and the flap e'l hinged tothe bottom of the frame in any suitable manner, by a cloth li'na eindiaited 5. As is well known, the irraine of the holder is providedwith a partition or soptuni (5, extending between the frame pieces 1 and2. and the end pieces 3, centrally thereof, thus dividing the rame intotwo compartments. one on eithe' side of the partition 6. In each of thecoii'i iartincuts, the side frame iiieniliers l are provided with theand s ceii'e th revolve t ordinzi y dark slide 9, wh

i'i-yiufg of the holder in dayl' the plate. The free eds d with a.recess l0 into no of the dark s when the flap is closed, as we and theslide is pushed wardly its full length.

The lower end piece 3 of the frame is shouldered as at 11, and the flapl is similarly shouldered as at 12, whereby a comparatively light leeris formed between these two elements when the flap is'closed. It willalso be noted from Figure 1, that the frame meniie lo wcr c 33 showndownber. 1 and 2 are cut away as at 18 at their lower ends to receivethe overlapping; ends iencc in sliding the holder in and out of acamera. It will also be noted with referenc to Figure 1, that the flapis provided adjacent its end with shoulders 14': which engage justinside of the frame pieces 1 and :2 when the flap is closed. This is tofurnish an additional light lock A spring may be cured to the part .'onor septum 6, centrally thereof, to exert a tension outwart ly wherebythe varying width of the plates which are used in the holder may becompensated for by pressing said plates outwardly to the limit of theirmovements, whereby the plates are held in the proper focal plane.

It will be understood that the plate holder just described is providedwith the identical construction shown in Figure 1 on the opposite sidealso, making it possible to carry two plates in the holder. Inasmuch asthe construction of both sides is identical, it is deemed necessary toshow and describe only one of them.

As before stated, the weak points in the construction so far described,lies in the fact that the shoulders 11, 12 and 14 as well as the ends ofthe flap which overlap the cutaway portions 13 of the frame, are notalways tight fitting, or become loose, or shrink, or are opened slightlyby the outward pressure of the spring 15 on the plate, thereby admittinglight around such shoulders to the plate. To overcome this difiicultyand to at the same time provide a means for securely holding the flapstightly closed, and for covering the exposed joints and points ofoverlapping, I have provided each of the frame members 1 and 2 with thepivoted catches 16. These catches are pivoted at one end as at 17 to thesides of the frame members 1 and 2, and are provided at the opposite endwith the embracing flanges 18 adapted to fit over the ends of the flaps4, when in exposed position, and when so fitted to cover the points ofoverlapping between the flap and the frame. The frame me nbers 1 and 2,and the flap 1, are cut away as at 19, to a depth ec ual to thethickness of the material of the catc es 16, whereby the outer surfaceof the catches will lie in the same plane as the outer surface of theholder.

Figure 4: shows a modified form of catch 20 pivoted at 21, and whichdiffers from the catch 16, only in that it is the same width as theframe member 2 and may be of the length shown in Figure 4, or extendcompletely down to the end of the frame member and flap as shown indotted lines at 22. There is some advantage in this type of constructionover that shown in Figure 1, in that the cut away portion 23 extendscompletely across the frame and is thereby easier to form than the cutaway portion 19 of the modification shown in Figure 1.

In the operation of the holder, the dark slide 9 is first removed, thecatches 16 raised to the position shown in Figures 1 and 2, the flap 4;pivoted downwardly, and a plate slipped into the holder guided in thegroove 8. The flap 4 is then closed, the dark side 9 inserted, and thecatches 16 pivoted down wardly to the position shown in Figure 3. Theholder is then ready for use in the camera, or for carrying about Untilready for use, without dange of light leaking past the joints betweenthe flap 4 and the frame of the holder, and spotting the plate or film.

Many changes in details of construction and operation may be made.vithout departing from the spirit of the invention. I do not limitmyself therelore to the exact form shown and described other than by theappended claims.

I claim 1. A plate holder comprising a frame provided with grooves forreceiving a plate and a protecting slide located therein. a hinged flapat one end of said frame permitlinf access to said grooves, and meansindependent of said slide movably mo ed on sa d frame for enge the ends01 s: -d flap and securing the sam in closed pos ion.

2. A plate holder comprising a frame provided with grooves for receivinga plate and a. protecting slide located therein, a hinged flap at oneand of said frame permitting access to said grooves, said flap alsoproviding a light lock for said plate, and means independent of saidslide movably mounted on said frame for securing said flap in closedposi don and for covering the pointsat which said fla p and frameoverlap.

8. A plate holder comprising a frame provided with grooves for receivinga plate and at protecting slide located therein, a hinged flap at oneend of said frame permi 'ng ac cess to said grooves, said flap being shoi ered and overlapping said fran'ie to provi 1 light lock for saidplate, and catches pivotc to said frame for embracing the ends of saidflap to hold the sane in ciosed position and to cover the points ofoverlapping between said '1 lap and frame.

A plate holder con p vided with grooves for r A protecting slidelocat--d therein. a h' at one end of said. fran'ie permitting access tosaid grooves, said flap being shouldered and overlapping said frame toprovide a light lock for said plate, catches pivoted to said frameadjacent said flap and adapted to embrace the ends of said flap when inclosed position whereby to secure it in such position and cover thepoints of overlapping between said frame and. flap, said frame and flapbeing cut away to receive said catches whereby the outside surfaces ofsaid frame, catches and flap lie in substantially the same plane.

CARL BORNMANN.

